Two-cycle gas-engine.



E. A. NELSON.- y TWO CYCLE GAS ENGINE.` l APPLICATION IILED MAR. 16, 1906.

Patented s'epn 15, 190s'.

www da i EMIL A. NELSON, OF DETROIT, MICHIGAN, SSIGNOR TO `WILLIAM J. NEW

j J. WOODALL, OF DETROIT, MICHIGAN.

` unirsi) srATEs PATENT oniiicn 'rwo-.eicnn Gas-ENGINE. y No. 898,9'13. y -SpecificationVofInattera Patent. Patented Septul, 1908.

appiicauon siedi-rma raises. serai massen.

To all whom it may concern:

Be it known thatI, EMIL A. NELSON, a citizen of the United States, residing at Detroit, inthe county of Wayne and State of Michigan, have invented certain new and' useful Improvements in Two-Cycle Gas-Engines, of which the following is a specification.

My invention relates to gas engines and consists in a gas engine having a cylinder closed at the ends an provided with iistons which alternately ap roach and recede, and with ports controlled y the pistons whereby to secure the introduction and compression and discharge of the gases by the action only of the istoiis and without the use of valves as set orth hereinafter and as illustrated in the accompanying drawing, in which- `Figures 1 and 2 are longitudinal sections of a gas engine embodying my invention showing the parts in different positions.

The cylinder A receives the two pistons B B and is closed at the ends, and the crank shafts b extend transversely through the cylinder near the ends, the cranks'being connected to the respective pistons by .means of connecting rods c. As thus constructed, the ends of the -cylinder constitute crank casings n which preferably are enlarged so as to permit of the use of longer cranks and a more] extended play of the pistons. .Near each end of the cylinder communicates a supply port 1 so arranged las to be closed by the piston except when the latter is in its inmost position, and with each end of the cylinder also communicates a channel 4, and each of the latter also communicates with the cylin# der through an inlet port 2 so arranged as to be coverei by a piston except when the latter is iii its outer position." With the cylin der also communicates exhaust ports 3 each so arranged as to be covered by a piston except when the latter is in its-outward osivtion. The supply ports 1, 1 communicate with a suitable carbureter D which may be supplied with volatile oil and air in an)r e the v usual ways, and at the center of the cylinder is an igniter I of any suitable character, an

.of which the electric circuit ma electrical igniter being shown which may be in connection with a commutator by means be completed and broken.

Pre erabljir the shafts 5 b are mechanically connected as yusual to secure a unison of operations ofthe pistons.

properlyv Assumingihe pisttns B, B', Fi i to be TON ANDOHARLES i I Y mixture in each outer chainberwill be slightly com ressed until the piston passes, the port 2 when the gases will pass throu h the said port into the central chamber in t e cylinder between the pistons. The ort 2 will be opened only momentarily an sufficiently to nermit this transfer and will immediately i e closed as the pistons begin to a proach each other so that the mixture will t en be confined between the two pistons and compressed until the two pistons are at 75` the limit of their inward movements when the ignter will explode the charge and the pistons be driven outward. The gases will e confined and exert their pressure until each of the exhaust ports will be uncovered when they will pass outward, there being less resistance at these ports than at the ports 2 which are simultaneously uncovered and where the fresh gases will flow in'-.vard'under the partial compression in the chambers at 35 the ends of the cylinders. It will thus be seen that at each rotation there is an explosion of a charge, and the discharge of the spent gases, and an'introduction and compression of a fresh charge, that is, at each rotation of the shaft, the pistons are moved outward, the fresh charge is transferred to the central chamber, compressed and ex-` ploded wit-hout the uso of any valvedevice pistons themselves. That is all of the ports and channels are openedhin other Words without valves. It will therefore be seen." that the engine is of extremely simple construction, that the operatic-ns are not accom-'10a panied with any noise such as res'ults'from the closing of valves,l and that the diliculties incident to Aimproper valvef action are.

avoided.

'independently of the valve-like action of the 95 Without i'imiting myssii to the consent-'155 tion shown or to any special arrangement of ports and assa es otherwise than required to secure t e 'di erent results, I claim:-"

V 'lhe combination in agas engine of a cylinder, two pistons arranged to reciprocate ,I

` '5m-the pistons, end two inlet ports each arv 5 ranged to be uncovered by one of the pistons arranged Ato be uncovered by one of the pistons as the adjacent exhaust port is uncovered. t

In testimony whereof I affix my signature in presence of twowitnesses.

EMIL A. NELSQN.

therein, casio coinmuncating with the outer ends of t e cylinder, end crank shafts having cranks in said casings connected to 'as it comp'retes its inner movement, two exheust por-ts each-arranged to be uncovered by one of the pistons es it completes its outer movement, and two other ports each in con- 10 .stent connection with one of the cesings and Witnesses:

FRANCIS `W. ALLEN, CEAS. E. Mormon. 

